# Question: We want to know which of two types of filters

We want to know which of two types of filters should be used. A test was designed in which the strength of a signal could be varied from zero to the point where the operator first detects the image. At that point, the intensity setting is recorded. Lower settings are better. Twenty operators were asked to make one reading for each filter.

Assuming the intensity readings are normally distributed, estimate the mean difference between the two readings using a 90% confidence interval.

Assuming the intensity readings are normally distributed, estimate the mean difference between the two readings using a 90% confidence interval.

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